Mark O'Brien
Acting • Born 1984-05-07
Biography
Mark O'Brien (born May 7th, 1984) is a Canadian actor and director. He is best known for playing the role of Des Courtney in Republic of Doyle (2010) and Tom Rendon in Halt and Catch Fire (2014).
Filmography
54 credits
Seven Veils
Movie • 2025
Paul
The Four Horsemen
Movie • 2008
Eric Rollins
Grown Up Movie Star
Movie • 2009
Will
Cut from the Same Cloth
Movie • 2009
Jack Cochrane
Heartless Disappearance Into Labrador Seas
Movie • 2008
Charlie
Shadow of God
Movie • 2025
Mason Harper
Snarbuckled
Movie • 2010
Jacob O'Higgins
The Dark Stranger
Movie • 2016
Mark
Nuremberg
Movie • 2025
Colonel John Amen
End of Days, Inc.
Movie • 2015
Jason
The Voices of Our Mother
Movie
William
Beat Down
Movie • 2012
Michael
Arrival
Movie • 2016
Captain Marks
Anon
Movie • 2018
Cyrus Frear
State Like Sleep
Movie • 2019
Darren
Kin
Movie • 2018
Jake
Parallel
Movie • 2018
Josh
The Darkest Minds
Movie • 2018
Rob Meadows
How to Plan an Orgy in a Small Town
Movie • 2015
Bruce Buck
Bad Times at the El Royale
Movie • 2018
Larsen Rogers
Marriage Story
Movie • 2019
Carter Mitchum
The Front Runner
Movie • 2018
Billy Shore
How It Ends
Movie • 2018
Jeremiah
Goalie
Movie • 2019
Terry Sawchuk
Hammer
Movie • 2019
Chris Davis
Ready or Not
Movie • 2019
Alex Le Domas
Blue Bayou
Movie • 2021
Ace
The Righteous
Movie • 2021
Aaron Smith
Mum's the Word
Movie • 2009
Curtis
Epilogue
Movie • 2008
Henry
Brad
Movie • 2010
Brad
The Outer Threat
Movie
Dennis
Movie • 2015
Dennis
Falsehood
Movie • 2025
Elizeus Carrier
Quiet at Dawn
Movie • 2009
Watts
Topper
Movie • 2025
Topper
The One That Got Away
Movie • 2008
Tommy Palchek
Better People
Movie
John
Sweetieface
Movie • 2013
Sam
Wanderer
Movie • 2016
Eric
Nice People
Movie
Perry Mason
TV • 2020
Thomas Milligan
Republic of Doyle
TV • 2010
Des Courtney
The Last Tycoon
TV • 2017
Max Miner
61st Street
TV • 2022
Officer Logan
Killjoys
TV • 2015
Grayson Hicks
The Kelly Clarkson Show
TV • 2019
Self
City on a Hill
TV • 2019
Jimmy Ryan
Hannibal
TV • 2013
Randall Tier
Warehouse 13
TV • 2009
Jerry Hoffler
Halt and Catch Fire
TV • 2014
Tom Rendon
Your Honor
TV • 2020
Father Jay
The Copenhagen Test
TV • 2025
Edmund Cobb
The Sticky
TV • 2024
Charlie